Sound reproducing device



y 1932- J. T. FITZSIMMONS 1,368,660

SOUND REPRODUCING DEVI CE Filed Aug. 16. 1930 A TTORIVEV Patented July 26, 1932 EJETEE STATES PATENT OFFICE JOHN T. FITZSIMMONS, or HAR'rronn, .connnc'rrcu'r sounn nnrnonuclna nEvIcE' Application filed. August 16, 1939. Serial No. 475,671.

This invention relates to means which are employed for transmitting the mechanical vibrations produced by a record to the sound torted or confused by. foreign commingled discordant or scratching noises.

This object is attained by housing the 15 needle used in machines of this character in a metallic body of particular formation and containing considerable mass, which body may be made integral with, but is preferably detachably applied to the ordinary needle 20 mounting frame, the needle being tightly fitted into and supported substantially throughout its entire length against lateral deflection, by the body, other than that produced by the record.

In the accompanying drawing Fig. 1 shows a side elevation of the sound reproducing elements of a talking machine with an embodiment of the invention applied thereto. Fig. 2 shows a plan with apart in sec- 30 tion, of the elements illustrated in Fig. 1. Fig. 3 shows a plan with a needle housing body formed integral with the supporting frame. Fig. 4: on larger scale shows a section of the detachable needle housing body.

85 Fig. 5 is a section showing a modified form of a needle housing body.

The needle housing 10 illustrated in Figs. 1 and 2 is a solid cylindrical body of metal with an integral stemv 25, Fig. 4, extending axially from its inner'end. This stem is designed to be entered into the usual needle opening in the needle mounting frame 11 of the common commercial forms of talking machine reproducers 12, and be secured therein by a clamp screw 13. The outer end of the cylindrical needle housing has its upper and lower sides somewhat beveled, preferably the upper beveled surface 16 being longer than the lower beveled surface 17 Extending axially inward from the beveled end andthrough or substantially through the body of the housing, is the opening 23 in which the needle 14, preferably steel, is closely fitted'an'd is secured by the clamp screw 15 so that the needle is prevented from any lateral deflection orvibration relative to the body of the needle housing. A circular per;

foration 18 is made transversely through the body near the beveled end and across the needle opening; Whatever vibrations are effected by the record 19 upon'the needle are T transmitted through the mass of. the body member to the needle mounting frame and from there to the sound emission diaphragm of the reproducer in the usual manner. I In the modification illustrated in Fig.3 the body member of the needle housing 21 is made integral'with the projecting hub 20 of the usualvibrating frame.

Inthe form; shown by Fig. 5 the needle I opening 26 is at one side of'the axis ofthe body member and its stem 27. In this form' the body is bevelled oil on one side only and I have found in practice after long experimentation that byin'aking the needle housing as described, that is, of a considerablemass of solid metal of cylindrical shape in general,

with the bevelled surfaces and transverse perforation at one end and the integral stem at the other end, and having the needle substantially enclosed and tightly secured, that the vibrations induced by the record are transmitted fully and truly to the sound emission diaphragm, and that discordant vibrations, such as would produce metallic and scratching sounds, are apparently absorbed,

is provided with twotransverse perforations smothered or eliminated by the relatively massive body of the shapedescribed through the body intermediate the ends of said needle opening, a needle thrust into said needle opening, and a clamp screw threaded transversely into the body to the needle opening.

2. Means for transmitting vibrations caused by the record in a talking machine, comprising a cylindrical metallic body of relatively large mass having an integral supporting stein extending axially from one end and having the other end beveled with a needle opening extending from the bevelled end entirely through the body and a circular opening extending transversely of the body adjacent to the bevelled end, a needle thrust into the needle opening, and a clamp screw threaded transversely into the body to the needle opening.

3. Means for transmitting vibrations caused by the record in a talking machine, comprising a cylindrical metallic body having an integral supporting stem extending axially from one end and having the upper and lower surfaces at the other end bevelled with a needle opening extending from the bevelled end entirely through the body and an opening transversely of the body between the bevelled surfaces, a needle thrust into the needle opening, and a clamp screw threaded transversely into the body to the needle openmg.

4. Means for transmitting vibrations caused by the record in a talking machine, comprising a cylindrical metallic body having a supporting stem extending axially from one end and having the other end bevelled with a needle opening extending through the body at one side of its axis and openings extending transversely of the axis of the body, a needle with an end inserted in the needle opening and a clamp screw threaded transversely into the body to the needle opening.

In testimony whereof I hereto aflix my signature.

JOHN T. FITZSIMMONS. 

